| <!DOCTYPE> | 
 |  | 
 | <html> | 
 | <head> | 
 |   <style> | 
 |     .box { | 
 |       height: 100px; | 
 |       width: 100px; | 
 |       margin: 10px; | 
 |       border: 1px solid black; | 
 |       background-repeat: no-repeat; | 
 |       -webkit-mask-repeat: no-repeat; | 
 |       -webkit-transition-duration: 1s; | 
 |       -webkit-transition-timing-function: linear; | 
 |       -webkit-transition-property: -webkit-background-size, -webkit-mask-size; | 
 |     } | 
 |      | 
 |     #box { | 
 |       background-image: url('../fast/backgrounds/repeat/resources/gradient.gif'), url('../fast/backgrounds/repeat/resources/gradient.gif'); | 
 |       background-position: 0 0, 50px 50px; | 
 |       -webkit-background-size: 0% 0%, 50% 50%; | 
 |     } | 
 |      | 
 |     #box.final { | 
 |       -webkit-background-size: 50% 50%, 0% 0%; | 
 |     } | 
 |      | 
 |     #box1 { | 
 |       background-color: gray; | 
 |       -webkit-mask-image: url('../fast/backgrounds/repeat/resources/gradient.gif'), url('../fast/backgrounds/repeat/resources/gradient.gif'); | 
 |       -webkit-mask-position: 0 0, 50px 50px; | 
 |       -webkit-mask-size: 0% 0%, 50% 50%; | 
 |     } | 
 |  | 
 |     #box1.final { | 
 |       -webkit-mask-size: 50% 50%, 0% 0%; | 
 |     } | 
 |  | 
 |   </style> | 
 |   <script src="../animations/resources/animation-test-helpers.js"></script> | 
 |   <script type="text/javascript"> | 
 |  | 
 |     const expectedValues = [ | 
 |       // [time, element-id, property, expected-value, tolerance] | 
 |       [0.5, 'box', '-webkit-background-size', "25% 25%, 25% 25%", 4], | 
 |       [0.5, 'box1', '-webkit-mask-size', "25% 25%, 25% 25%", 4], | 
 |     ]; | 
 |    | 
 |     function setupTest() | 
 |     { | 
 |       document.getElementById('box').className = 'box final'; | 
 |       document.getElementById('box1').className = 'box final'; | 
 |     } | 
 |    | 
 |     runTransitionTest(expectedValues, setupTest); | 
 |   </script> | 
 | </head> | 
 | <body> | 
 |  | 
 |   <div id="box" class="box"></div> | 
 |   <div id="box1" class="box"></div> | 
 |  | 
 |   <div id="result"> | 
 |   </div> | 
 |  | 
 | </body> | 
 | </html> |